ok i have no idea what is wrong with my car. fri evening after work i go out to start it nothing happens. i think maybe battery? so i get a jump nothing. then it starts clicking like it could be? so anyway then it does absolutely nothing. no sounds no cranking. it's pouring rain and i try anything i can think of. finally just called a tow truck an hour later they come and i put it in nuetral and then i crank it . it starts? and put back in drive runs fine. ran fine all the way home 25+ miles. so the next day i try to start it and starts right up. i don't drive it. anyway so today i tried to start it today and nothing. i tried all the same things nothing. then i hear a weird sound. i notice when i open my door my elec fan comes on and when i shut it it turns off. this is w/o the key on or even in. what could it possibly be and where do i start?
please help me!!!!!!!

please help me!!!!!!!